I've been lamenting the fact that the Bolero doesn't come in a light colored sun/heat friendly fabric. I want... a Solero!

Then I realized, I can make my own solero by chopping up an old lightweight technical undershirt shirt in the desired pale color, and then just stitching the edges up a little bit to keep the fabric from unravelling. It probably wouldn't be as nice as the Boleros, but for coverup sun protection on the arms I think it's worth it.